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In Situ Micro-Pillar Compression to Examine Radiation-Induced Hardening Mechanisms of FeCrAl Alloys

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Document pages: 29 pages

Abstract: The effects of 5 MeV Fe2+ ion irradiation at 300 °C on the microstructure evolution and deformation behavior of a FeCrAl C26M alloy are presented. It has been found that dislocation loop density increases an order of magnitude from 1 dpa to 16 dpa irradiations, whereas, the dislocation loop size saturates with increasing damage. Micropillars, 600 nm in diameter and 1.3 um in height, were fabricated and compressed inside grains with <001>, <011> and <111> crystallographic orientations, respectively. {112} <111> has been identified as the primary slip system. The irradiation-induced hardening generally follows the prediction of Orowan dispersed barrier hardening equation, even though the exact increasement of yield stress after irradiation is presented heterogeneously across three orientations. Detailed transmission electron microscopy (TEM) studies were performed to quantify the Burgers vector and the distribution of irradiation induced dislocations. It is revealed that localized shear instability is caused by avalanche slip events of ½<111> dislocations gliding out of tested pillars. Simultaneously, a large number of sessile immobile <100> dislocations formed in the vicinity of slip band, leading to the hardening at elevated strains.

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